Primary pulmonary malignant melanoma diagnosed with percutaneous biopsy tissue: A case report

Figure 2 Microscopic examination of the tumor. A and B: Hematoxylin-eosin staining showing the histological feature of the tumor cells. Fine melanin granules exited in or out of the cells (orange arrow); C-E: Immunohistochemical results shown positive staining of human melanoma black 45, S-100 and Melan A, and negative staining of cytokeratin (pan); F: In biopsy tissue (image C-F is magnified 400 ×).